Rochelle salt in an inhomogeneous electric field |
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Authors: | B Fugiel |
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Institution: | (1) August Chełkowski Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland |
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Abstract: | The parameters of the hysteresis loop in the ferroelectric Rochelle salt
were investigated using a sample with two pairs of electrodes: measurement
electrodes and the side ones. It has been shown that the difference between
the potentials of the measurement and the side electrodes (generating an
inhomogeneous electric field) leads to gradual decay in time t of the
remanent polarization Pr. The time required for the hysteresis loop to
disappear in the inhomogeneous electric field (not parallel to the
ferroelectric axis) decreases with temperature increase from 44±3 h
at – 9°C to 2.3±0.1 h at 21.9 °C. On the other hand, the
crystal placed for a sufficiently long time simultaneously in the measuring
electric field and in the constant inhomogeneous one may finally exhibit a
stationary hysteresis loop with a reduced remanent polarization and the
unchanged coercive field. It has been shown that the crystal as a whole does
not have to be polarized perpendicularly to the ferroelectric axis in order
for its hysteresis loop to be reduced. |
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Keywords: | 77 80 -e Ferroelectricity and antiferroelectricity 77 80 Dj Domain structure hysteresis 77 80 Fm Switching phenomena |
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